One-step synthesis of hierarchically porous hybrid TiO<sub>2</sub> hollow spheres with high photocatalytic activity

doi:10.1007/s11706-016-0323-2

Front. Mater. Sci.

2016, Vol. 10

Issue (1) : 15-22 https://doi.org/10.1007/s11706-016-0323-2

RESEARCH ARTICLE

One-step synthesis of hierarchically porous hybrid TiO₂ hollow spheres with high photocatalytic activity

Ruiping LIU^1,^*(

),Feng REN¹,Jinlin YANG¹,Weiming SU¹,Zhiming SUN²,Lei ZHANG³,Chang-an WANG⁴

1. Department of Materials Science and Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
2. School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
3. Department of Mechanical Engineering, PO Box 755905, University of Alaska Fairbanks, Fairbanks, AK 99775, USA
4. School of Materials Science and Engineering, State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China

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Abstract

Hierarchically porous hybrid TiO₂ hollow spheres were solvothermally synthesized successfully by using tetrabutyl titanate as titanium precursor and hydrated metal sulfates as soft templates. The as-prepared TiO₂ spheres with hierarchically pore structures and high specific surface area and pore volume consisted of highly crystallized anatase TiO₂ nanocrystals hybridized with a small amount of metal oxide from the hydrated sulfate. The proposed hydrated-sulfate assisted solvothermal (HAS) synthesis strategy was demonstrated to be widely applicable to various systems. Evaluation of the hybrid TiO₂ hollow spheres for the photo-decomposition of methyl orange (MO) under visible-light irradiation revealed that they exhibited excellent photocatalytic activity and durability.

Keywords titania hybrid composite hollow spheres photocatalytic property

Corresponding Author(s): Ruiping LIU

Online First Date: 25 December 2015 Issue Date: 15 January 2016

Cite this article:

Ruiping LIU,Feng REN,Jinlin YANG, et al. One-step synthesis of hierarchically porous hybrid TiO₂ hollow spheres with high photocatalytic activity[J]. Front. Mater. Sci., 2016, 10(1): 15-22.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-016-0323-2
https://academic.hep.com.cn/foms/EN/Y2016/V10/I1/15

Fig.1 A schematic illustration of the formation mechanism of TiO₂ hollow spheres.

Fig.2 (a)(b)(c) SEM and (d) TEM images of TiO₂ hollow spheres prepared by using ZnSO₄·7H₂O as templates.

Fig.3 XRD pattern and (b) N₂ adsorption–desorption isotherms (inset: pore size distributions) of the as-prepared TiO₂ hollow spheres.

Fig.4 XPS spectrum of TiO₂ hollow spheres (inset: the high-resolution XPS spectra of Zn2p).

Fig.5 SEM images of TiO₂ hollow spheres prepared with the stirring speed of (a) 200 r/min, (b) 300 r/min, (c) 400 r/min, (d) 500 r/min, (e) 600 r/min and (f) 800 r/min.

Fig.6 SEM and TEM (the inset) images of TiO₂ hollow spheres prepared by using (a) FeSO₄•7H₂O, (b) MgSO₄•7H₂O and (c) CoSO₄•7H₂O as templates.

Fig.7 XRD patterns of TiO₂ hollow spheres prepared by using FeSO₄•7H₂O, MgSO₄•7H₂O and CoSO₄•7H₂O as templates.

Fig.8 XPS spectra of (a) TiO₂/Fe₂O₃, (b) TiO₂/MgO and (c) TiO₂/Co₂O₃ spheres.

Fig.9 UV-vis absorption spectra of the hybrid TiO₂ hollow spheres.

Fig.10 Photocatalytic degradation of MO solution over different photocatalysts under visible-light irradiation (λ>420 nm).

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